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Re:Asynchronous filesystem replication with FUSE and rsync by rwmj on Thursday December 11, 2014 @10:09AM (#8735097)
There's a new thing (fanotify). LWN did a short series on different filesystem notification methods in July:

https://lwn.net/Articles/604686/

https://lwn.net/Articles/605128/

Unfortunately the fanotify article is yet to come!

(Having said that, I certainly appreciate your pain trying to use inotify to track write events on an entire filesystem)

Re:Asynchronous filesystem replication with FUSE and rsync by mopo2000 on Thursday December 11, 2014 @02:38PM (#8736645)
fanotify is super limited, and not useful for this app. It's from 2009, but has seen little use.